<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <script src="./jquery-3.3.1.js"></script>
    <link rel="stylesheet" href="./style.css">
    <title>Document</title>
</head>
<body>
    <div id=wrapper class="wrapper">
        <button id=clickMe>点我</button>
        <div id=popover class="popover">浮层
        </div>
    </div>  
    <script src="./main.js"></script> 
</body>
</html>